High-precision PTAT current source based on the Meijer cell

Carvalhaes-Dias, Pedro; Guimarães, Hélio; Dias, José Antonio Siqueira

doi:10.1080/00207217.2017.1335796

Cited by 2 publications

(5 citation statements)

References 12 publications

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“…At this point, it can be derived directly using the resistance definition formula. Therefore, the formula for the coil resistance is as follows: R = ρl length wh L (7) where ρ denotes the resistivity of the wire, l length represents the length of the wire, w is the width of the copper-clad wire, and h L is the thickness of the copper-clad wire.…”

Section: A Model For Calculating the Coil Resistancementioning

confidence: 99%

“…For the inductance between PCB coils, Jonsener Zhao [11] provided an engineering estimation formula for k for the mutual inductance between multiple layers of PCB spiral coils with less than 20 turns. According to the literature, this formula still possesses reference value as an approximate calculation when the outer coil diameter is much greater than the distance between the two coils' layers in the case of the number of turns exceeding 20 [4,7].…”

Section: Comparison Of Theoretical Calculation Effectsmentioning

confidence: 99%

“…From Equation (7), the resistance of the single-layer coil at this point equals approximately 2.13 Ω. Due to the similarity of the two coils under consideration, the primary coil itself has a resistance of 2.13 Ω.…”

Section: Comparison Of Theoretical Calculation Effectsmentioning

confidence: 99%

“…The second one is how to control the accuracy of the output waveform and generate the waveform without distortion. Carvalhaes-Dias et al [7] designed a proportional to absolute temperature (PTAT) current source with a maximum nonlinearity of 0.44 ppm/C. Wei et al [8] designed a current source with a ripple ratio of 0.1% and an amplitude of 100 A based on the requirement of Hall element detection.…”

Section: Introductionmentioning

confidence: 99%

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A Non-inductive Coil Design Used to Provide High-Frequency and Large Currents

Zhu,

2024

Sensors

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Currently, cutting-edge, high-frequency current sources are limited by switching devices and wire materials, and the output current cannot take into account the demands of a high peak and low rise time at the same time. Based on the output demand of a current source, a non-inductive coil for providing high-frequency, high current sources with low rise times is designed. The coil is appropriately designed according to the principle of the ampere-turn method, where several turns of wire are utilized to linearly synthesize the current to obtain high-frequency currents with amplitudes up to 30 kA. However, the inductance formed after winding the coil could possess a hindering effect on the high-frequency current. In the present investigation, based on the law of energy conservation and utilizing the principle of transformer coupling, the inductor’s hindering effect on high-frequency currents is appropriately eliminated by consuming the stored energy of the inductor innovatively. Theoretical calculations and practical tests show that the inductance of a two-layer 28-turn coil is 42 times smaller than that of a two-layer, 28-turn perfect circular spiral PCB coil. The measured inductance is only 6.69 μH, the output current amplitude is calculated to be up to 33 kA with a rise time of 20 ns, and the output waveform corresponding to a 1 MHz square wave is not remarkably distorted. This effective design idea could be very helpful in solving the problem of high peak values and low rise times in high-frequency, high-current source output design.

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Section: A Model For Calculating the Coil Resistancementioning

confidence: 99%

Section: Comparison Of Theoretical Calculation Effectsmentioning

confidence: 99%

Section: Comparison Of Theoretical Calculation Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Non-inductive Coil Design Used to Provide High-Frequency and Large Currents

Zhu,

2024

Sensors

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“…The variation of V BE with temperature is well known [15]. For a transistor biased with a constant collector current I C0 , it can be conveniently expressed as the sum of a constant term, a linear term (which decreases with temperature), and a term that is non-linear with temperature [16]:…”

Section: Principle Of Operation Of the Single Transistor Soil Water Cmentioning

confidence: 99%

Autonomous Soil Water Content Sensors Based on Bipolar Transistors Encapsulated in Porous Ceramic Blocks

et al. 2019

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We present an autonomous sensor to measure soil water content that uses a single heat pulse probe based on a transistor encapsulated in a porous block. The sensor uses a bipolar junction transistor, which performs as both a heating and temperature-sensing element. Since the sensor depends on a porous block to measure the matric potential of the soil, it does not suffer from accuracy problems if the contact between the probe and the soil is not perfect. A prototype of the sensor showed a temperature variation of Δ T = 2.9 ∘ C when the porous ceramic was saturated with water. The sensor presented an almost linear behavior for small changes in the matric potential of a red latosol when tested in the 1-kPa and 35-kPa pressure range, showing a sensitivity of S = 0.015 ∘ C/kPa. The ultra-low power signal conditioning circuit can read the sensor’s temperature with a resolution of approximately 0.02 ∘ C, so the matric potential can be read in increments of at least 1.33 kPa. When powered only by a 2-F supercapacitor from the energy-harvesting system, the interrogation circuit is able to take one soil water content measurement per day, for eleven days.

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High-precision PTAT current source based on the Meijer cell

Cited by 2 publications

References 12 publications

A Non-inductive Coil Design Used to Provide High-Frequency and Large Currents

A Non-inductive Coil Design Used to Provide High-Frequency and Large Currents

Autonomous Soil Water Content Sensors Based on Bipolar Transistors Encapsulated in Porous Ceramic Blocks

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